visible light, ultraviolet or X-rays. The specific properties of a semiconductor depend on the impurities -- known as dopants -- added to it. This makes it an ideal medium to control electricalcurrentand everyda
In fluorescent tubes used for lighting, "ultraviolet radiation with a wavelength of 254 nm is produced along with the blue light that is emitted when an electric current is passed through mercury vapor," according to theUniversity of Nebraska. "This ultraviolet radiation is invisible but contains ...
Spot UV is a popular coating technique where high-gloss UV coating is applied to a product, by using ultraviolet (UV) light to cure the printed material’s varnish. This spot UV printing method gives the targeted “spots” a shiny, vibrant aesthetic, and adds a protective coating to the ...
Whatever product you use should give off only visible light, because ultraviolet light damages the eyes. If you are photosensitive (对光敏感的), you may develop a rash. Otherwise, the main drawback is having to sit in front of the light for 30 to 60 minutes in the morming That's an ...
WhatisUltraviolet? Animportantthingtoknowisthatultraviolet(UV)isnotasingleentity,butawidebandof wavelengths.ThechiefnaturalsourceofUVisthesun,mostofwhichisintheregionbetween 300nm-400nm.ArtificialsourcesofUVincludeincandescent,gasdischarge,lowpressuremercury, mediumpressuremercurymetalhalide,electrodelessandxenonlamps...
Diode-pumped solid-state lasers can deliver high power output in the green or ultraviolet and have excellent beam quality. This makes them a desirable source for two specific types of etching applications. The first is with materials that simply don’t absorb well at longer wavelengths. This is...
Extracorporeal photopheresis (ECP) is a technique that was developed > 20 years ago to treat erythrodermic cutaneous T-cell lymphoma (CTCL). The technique involves removal of peripheral blood, separation of the buffy coat, and photoactivation with a photosensitizer and ultraviolet A irradiation ...
EPROM (erasable programmable read-only memory) ismemorythat does not lose its data when the power supply is cut off. The data can be erased and the chip reprogrammed by shining an intense ultraviolet (UV) light through a window designed into the memory chip. This process is known asburning...
I can't remember whose idea it was for us to meet again.我不记得让我们再次相见是谁的主意。Mr Liu wants to talk to the students whose homework hasn't been handed in.刘老师要跟那些没交家庭作业的学生谈话。【what】What happened next?后来发生了什么事?What is this used for?这做...
A flare may be triggered by stress, ultraviolet light, or an infection, such as a cold. It can also be triggered by cigarette smoke or foods you eat. The following can help you prevent flares:Eat healthy foods. Healthy foods include fruits, vegetables, whole-grain breads, low-fat dairy ...